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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439c599bc28f3a36dc3be23c12d68c8074863a2232abd7490264fb54679a9c09' 
  AND token = '2VO71lNtL6GQBl+eSQXbByCWkt8+quoBWuLH0IJKbPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}